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(No Model.)

L. W. OBRIAN. RIGHT ANGLE TOOTH HOLDER.

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UNITED STATES PATENT OFFICE.

I JEONARD XV. OBRIAN, ()F BELLEVUE, OHIO, ASSIGNOR TO THE FREMONT OULTIVATOR COMPANY, OF SAME PLACE.

RIGHT-ANGLE TOOTH-HOLDER.

SPECIFICATION forming part of Letters Patent No. 410,435, dated September 3, 1889.

Application filedJune 15, 1888. Serial No. 277,221. (No model.)

.To all whom it may concern.-

Be it known that I, LEONARD W. OBRIAN, a citizen of the United States, residing at Bcllevuc, Huron county, State of Ohio, have invented a certain new and useful Improvement in Right-Angle 'looth-Holders, of which the following is so full, clear, and exact a description as will enable others skilled in the art to which my invention appertains to make and use the same, reference being had to the accompanying drawings, in which- Figure 1 is a perspective view of a portion of a rake-head provided with perforations through which extend rake-teeth which are secured in place by my improved holder. Fig. 2 is a transverse vertical section of the rakehcad and holder 011 the plane 00 m, a part of a tooth being shown in full. Fig. 3 is a rear elevation of the same, showing a part of the tooth-holder broken away and exposing the tooth at its secured end to illustrate the mode of fastening it at this point.

This invention, while it relates to toothholders generally, is especially adapted to use on a steel-tooth wheel horse-rake.

The object of the invention is to construct a tooth-holder by the use of which the teeth may be securely and positively fastened at their upper ends to the head of the rake in such a manner that crystallization and consequent breaking are entirely avoided at the securing-point.

Another object of my invention is to provide a tooth-holder by the use of which, in combination with a peculiarly-constructed tooth and rake-head, the tooth may have a free oscillating movement below the point of security without liability of becoming broken or distorted.

These objects are accomplished by providing the rake-head with a peculiar kindof opening, making the tooth of peculiar shape, and securing the tooth to the rake-head with such an angular tooth-holder as will be particularly described in the following specification, in connection with the accompanying drawings, in which A designates a semicircular steel tooth for a wheel horse-rake, at the upper end of which is formed a sweeping curve B, the outer tip of which has a straight portion 0, which is bent at right angles to the line of the main portion of the tooth, as is clearly shown in Fig. 3. This sweeping curve is designed to serve as a means of distributing the flexure near the point of attachment of the tooth over a greater surface, thus greatly decreasing its intensity. Indeed, so gentle is the curvature imparted even by a great displacement of the tooth-point that all internal change from flexing strains in the tooth is obviated. The double support afforded by the roofs of the two portions of the apertures in the rakehead conspires tore-enforce this beneficial effect. This rake-tooth A is adapted to be extended through a perforation in the rake-head D, where it is secured in the position shown in the drawings and held in place by the toothholder E. The perforation for the tooth is of a sufficient size on the front side of the rake-head to receive the rake-tooth, which about fills the perforation, as clearly shown at F in Fig. 2. The remaining portion of the perforation to the rear of the portion F is made considerably larger, as shown at G in the same figure. This construction will give the rake-tooth a certain amount of vertical play at the opening in the rear of the rakehead.

The holder E may be made of any material,

but preferably of malleable iron, and is perforated at Hfwhere it receives abolt I, which holds it rigidly to the head D. Each side of this central perforation H the holder is provided with a longitudinal recess J for the reception of the bent ends C O of the teeth A A, each holder serving to secure two or more teeth in place. The front of the holder is provided with semicircular depressions or openings 6 6, through which extend the curve B of the teeth A A just where the ends C C are bent away therefrom and at a right angle to the line of the main portion of the tooth A. The recesses J J are separated from each other by a boss K, which encircles the perforation H through the central portion of the holder, and which boss serves to support the pressure of the nut above it.

From the foregoing it will be seen at a glance that the tooth will be free to move vertically a slight distance within the rear enlarged portion G of the rakehead D, which will prevent breakage should the tooth encounter any rigid obstacle while the rake is being used. In many instances the obstacle which 0bstruets the pathway of the rake is of such a shape and of such a material as to prevent the tooths penetrating, which necessitates the tooths slipping over it or under it or to one side of it. By constructingthe rake-tooth with the sweeping curved portion B between the end which is rigidly secured to the head and the lower end of the tooth, and by securing this tooth to the rake-head and extending it through a perforation in the rake-head,

which perforation is larger at the rear of thehead than at the front, provision is made for slight oscillation and vibration up and down in the recess G of the tooth, thus practically avoiding all danger of breaking the tooth or distorting the rake, rake-head, tooth, and its fastenings.

To the rear of the holder E, I provide downwardly-projecting lugs orfingers, which form an elongated slot L, making a metallic bushing and friction bearing against'which the tooth slides, and by which it is steadied as it plays vertically in the perforation G at the rear of the headD of the rake. These fingers form an open-ended slot, as shown in Fig. 2.

I do not wish to be understood as limiting myself to the exact construction shown and described, as it is obvious that one or more bolts maybe used with equal advantage to hold the holder in place, and various other minor details may be varied at will without departing from and without in any Way interfering with the usefulness of my invention.

Having now described the objects, uses, and

advantages of my device, what I wish to secure by'Letters Patent, and what I therefore claim, is

1. A tooth-holder provided with a longitudinal recess communicating with an o enin g at an angle thereto, in combination with a perforated rake-head to which said holder is secured, said holder provided with guardlugs extending down along the sides of the perforation in the rake-head,for the purposes specified.

2. The combination of a head provided with a perforation for the tooth, said perforation being large at one end and small at. the other end, a tooth provided with a sweeping curved portion located between said perforation and the tooth-holder, and a tooth-holder rigidly secured to the head and holding the tooth in place, substantially as and for the purposes specified.

3. The combination of the head having a perforation large at one end and small at the other end, with a tooth having a curved portion between said perforation and its fixed end and having aportion at its upper end bent to engage with a tooth-holder, and a tooth-holder having vertically-extending fin gers or lugs forming a friction-bearing for the sides of the tooth and secured to the head at the large end of the perforation in the head, substantially as and for the purposes specified.

In testimony whereof I affix my signature in the presence of two witnesses.

LEONARD WV. OBRIAN. Witnesses:

GILBERT E. HALL, WALTER J. SMITH. 

